Monster Mike put that suspension on for a young man about a year or two ago maybe 3 years ago. It was documented very well here on classicbroncos. Com and may very well be posted somewhere on James Duff's website
If I remember they put a lot of it on FB too.
Maybe I mentioned this in my build thread but the hardest part of it for me was a.) locating the axle
exactly where you wanted it, b.) without moving the axle at all, fitting and temporarily installing the axle truss onto the axle and c.) without moving the axle at all put the four heavy arms on the truss and clamp the frame mounts to the frame for measuring. I redid the truss on axle location a couple times in an attempt to get it closer than where it was.
Then there was figuring-out exactly where the axle was supposed to go before even starting the above. We ended-up tacking an angle on the frame perfectly square to the frame for all our measurements and that made it easier. I'm sure it's like anything--the second time you do it it's easier.